Motor for household appliance and household appliance

Abstract

The embodiment of the utility model provides a motor for a household appliance. The motor (100) comprises: a shaft (1); a stator (2) fixedly arranged around the shaft (1); a rotor (3) arranged so as to be rotatable about the stator (2) and the shaft (1), the rotor (3) comprising a first end wall (31) located axially outward of the stator (2), the first end wall (31) being provided with a first rotor opening (311) through which the shaft (1) passes; and a blocking member (4) which is fixedly arranged around the shaft (1) and closes the first rotor opening (311). In addition, the utility model further provides a corresponding household appliance. According to some embodiments of the present application, foreign matter can be effectively prevented from entering the interior of the motor (100) through a simple structure.

Description

Technical Field

[0001] The present application relates to the field of household appliances, and in particular to a motor for a household appliance and a household appliance. Background Art

[0002] Motors are widely used in household appliances to provide driving force. Taking a range hood as an example, the motor can be arranged in a fan of the range hood to drive the impeller of the fan to rotate, thereby providing an airflow for extracting oil smoke.

[0003] At present, the fan of the range hood usually adopts an inner rotor motor, in which the motor housing is fixed, and the motor shaft rotates together with the impeller of the fan. There is generally no sealing structure between the fixed housing and the rotating shaft. However, during the use of the motor, oil and water vapor often invade the inside of the motor. This may cause problems such as corrosion of motor components and short circuit.

[0004] In addition, it is known that a complex structure can be used to prevent oil and water vapor from entering the interior of the motor, which will significantly increase the complexity of motor assembly and lead to higher dimensional accuracy requirements for related parts. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide an improved motor for household appliances and household appliances, so as to overcome at least one of the above-mentioned deficiencies of the prior art. In particular, according to the embodiments of the present application, foreign matter can be effectively prevented from entering the interior of the motor through a simple structure.

[0006] According to a first aspect of the present application, an embodiment of the present application provides a motor for a household appliance. The motor comprises: a shaft; a stator, which is fixedly arranged around the shaft; a rotor, which is arranged to be able to rotate around the stator and the shaft, and the rotor comprises a first end wall located axially outside the stator, the first end wall is provided with a first rotor opening, and the shaft passes through the first rotor opening; and a blocking member, which is fixedly arranged around the shaft and closes the first rotor opening.

[0007] In a household appliance, the blocking member can effectively prevent foreign matter (such as oil smoke, water vapor, etc.) from entering the interior of the motor. This is particularly advantageous for a household appliance implemented as a range hood. Thus, oil smoke can be prevented from entering and accumulating in the motor, thereby improving the reliability and service life of the motor and thus the range hood. This arrangement of the blocking member makes the motor structure simple and does not significantly increase the difficulty of assembling the motor.

[0008] According to an optional embodiment of the present application, the blocking member may be provided with a blocking groove surrounding the axial direction. The first end wall may include an end wall body and an end wall edge located radially inward of the end wall body. The end wall edge may surround the first rotor opening and extend into the blocking groove. A reliable dynamic seal may be formed between the blocking member and the end wall through the blocking groove and the end wall edge. As a result, each component does not need to have high dimensional accuracy and can effectively prevent foreign matter from entering the motor.

[0009] In this document, directional expressions such as "axial", "radial", and "circumferential" are based on the shaft of the motor. "Radially inward" may particularly refer to a direction radially toward the central axis of the shaft. "Axially inward" may particularly refer to a direction axially toward the inside of the motor, in particular toward the stator.

[0010] According to an optional embodiment of the present application, the blocking groove may be open in the axial direction, the end wall body of the first end wall may be transverse to the axial direction, and the end wall edge of the first end wall may extend from the end wall body in the axial direction. This helps to simplify the assembly process of the motor. The blocking member and the rotor can be assembled in the axial direction.

[0011] Optionally, the edge of the end wall extends toward the stator, and the blocking slot is open away from the stator. This is particularly helpful for easy assembly. The blocking element can be pre-fixedly connected to the shaft, and then the first end wall is sleeved on the shaft in the axial direction.

[0012] In particular, the length by which the edge of the end wall projects into the barrier groove may be between 3 mm and 5 mm.

[0013] According to an optional embodiment of the present application, the blocking groove may include a first groove side surface and a second groove side surface opposite to each other and a first groove bottom surface connecting the first groove side surface and the second groove side surface, and the second groove side surface is located radially outside the first groove side surface.

[0014] Optionally, the first radial spacing between the edge of the end wall and the first groove side may be between 0.5 mm and 1.5 mm.

[0015] Optionally, the second radial spacing between the end wall edge and the second groove side surface may be between 0.5 mm and 1.5 mm.

[0016] Optionally, the first axial distance between the edge of the end wall and the bottom surface of the first groove may be between 0.5 mm and 1.5 mm.

[0017] Optionally, the second groove side surface may extend beyond the first groove side surface in the axial direction away from the first groove bottom surface.

[0018] According to an optional embodiment of the present application, the first end wall may be provided with an end wall groove surrounding the axial direction, and the blocking member includes a blocking edge located on the radial outer side thereof, and the blocking edge may extend into the end wall groove. A reliable dynamic seal may be formed between the blocking edge and the end wall through the blocking edge and the end wall groove. Thus, each component does not need to have high dimensional accuracy and can effectively prevent foreign matter from entering the motor.

[0019] The end wall groove can be delimited in the radial direction by the end wall edge, and the blocking groove can be delimited in the radial direction by the blocking edge. By combining the blocking groove and the end wall groove, a meandering gap between the first end wall and the blocking member can be formed in a compact structure. Thus, the reliability of the dynamic seal can be further improved.

[0020] According to an optional embodiment of the present application, the blocking edge extends in the axial direction, and the end wall groove can be opened in the axial direction. This helps to simplify the assembly process of the motor. The blocking member and the rotor can be assembled in the axial direction.

[0021] Optionally, the blocking edge extends away from the stator and the end wall slot is open towards the stator. This is particularly helpful for easy assembly. The blocking element can be fixedly connected to the shaft in advance, and then the first end wall is sleeved on the shaft in the axial direction.

[0022] In particular, the length by which the barrier edge projects into the end wall groove may be between 3 mm and 5 mm.

[0023] According to an optional embodiment of the present application, the end wall groove may include a third groove side surface and a fourth groove side surface opposite to each other and a second groove bottom surface connecting the third groove side surface and the fourth groove side surface, and the fourth groove side surface is located radially outside the third groove side surface.

[0024] Optionally, the third radial spacing between the blocking edge and the third groove side may be between 0.5 mm and 1.5 mm.

[0025] Optionally, a fourth radial spacing between the blocking edge and the fourth groove side may be between 0.5 mm and 1.5 mm.

[0026] Optionally, the second axial distance between the blocking edge and the second groove bottom surface may be between 0.5 mm and 1.5 mm.

[0027] Optionally, the third groove side surface may extend beyond the fourth groove side surface in the axial direction away from the second groove bottom surface.

[0028] According to an optional embodiment of the present application, the blocking member and the first end wall are arranged in a non-contact manner relative to each other. Therefore, during the operation of the motor, the rotor rotates relative to the shaft, and the first end wall can rotate relative to the blocking member accordingly without being hindered. In addition, the rotation of the rotor will not cause damage to the first end wall or the blocking member.

[0029] Alternatively or additionally, the blocking member and the first end wall may partially overlap each other in both radial and axial directions, thereby forming a tortuous gap between the blocking member and the first end wall, which is beneficial for preventing foreign matter from entering the motor.

[0030] Alternatively or additionally, a gap having at least one L-shaped meandering segment may be formed between the blocking member and the first end wall.

[0031] According to an optional embodiment of the present application, the first end wall may include an outer ring portion, an inner ring portion located radially inside the outer ring portion, and a step portion located between the outer ring portion and the inner ring portion. The inner ring portion may be offset in an axially outward direction relative to the outer ring portion. The blocking member may be located radially inside the step portion. This helps to make the motor have a compact structure.

[0032] According to an optional embodiment of the present application, the blocking member can be configured as an elastic body made of elastic material. This helps to reduce the difficulty of assembling and disassembling the motor. The blocking member can be configured as a rubber member, for example. Thereby, the blocking member and the first end wall can be prevented from being bonded together due to corrosion or rust. The blocking member can be configured in particular in the shape of a disc.

[0033] According to an optional embodiment of the present application, the shaft may be provided with a mounting recess for the blocking member, the mounting recess extending in the circumferential direction and recessed radially inwardly, and the blocking member may be embedded in the mounting recess.

[0034] According to an optional embodiment of the present application, the blocking member may be provided with a lead-in hole, through which the wire passes through the blocking member. Providing the lead-in hole for the wire in the blocking member helps to enhance the sealing of the motor.

[0035] It is particularly advantageous if the blocking member is configured as an elastomer made of an elastic material and is provided with a lead-in hole. As a result, the wire passing through the lead-in hole can form a sealed connection with the blocking member at the lead-in hole without the need for an additional seal. As a result, the motor can have a simpler structure and assembly process and have good sealing. The wire can be connected to the stator, for example. The lead-in hole optionally passes through the blocking member in the axial direction. The lead-in hole can be located in particular in the radial direction between the shaft and the edge of the first rotor opening.

[0036] According to an optional embodiment of the present application, the blocking member may have a first outer surface exposed through the first rotor opening in the axial direction away from the stator. The first outer surface is, for example, flat.

[0037] According to an optional embodiment of the present application, the first end wall may have an opening edge away from the stator defining the first rotor opening, and the first outer surface may be flush with the opening edge in the axial direction or protrude beyond the opening edge in the axial outward direction. This helps prevent foreign matter, especially liquid oil or water, from entering the motor. During the operation of the motor, foreign matter on the first outer surface of the blocking member can be carried away by the radially outward airflow caused by the rotation of the rotor, and will not accumulate at the blocking member.

[0038] According to an optional embodiment of the present application, the first outer surface may be flush with a second outer surface of the first end wall in the axial direction facing away from the stator, or may protrude beyond the second outer surface in the axial outward direction.

[0039] According to an optional embodiment of the present application, the rotor may further include: a second end wall located at an end opposite to the first end wall in the axial direction, the second end wall being provided with a second rotor opening, the shaft passing through the second rotor opening; and a lining wall extending from the second end wall in the axial direction at the second rotor opening. The motor may further include a bearing, which is clamped between the lining wall and the shaft in the radial direction. Thus, the bearing not only assumes a supporting role, but also can prevent foreign matter from entering the motor through the second rotor opening. Optionally, all bearings of the motor arranged between the rotor and the shaft are clamped between the lining wall and the shaft. The lining wall may extend from the second end wall in a direction toward the stator. The stator may include a stator winding, and the bearing is at least mostly in the same axial position as the stator winding of the stator. Therefore, the motor may have a compact structure, in particular, a reduced axial dimension.

[0040] According to an optional embodiment of the present application, the motor may further include a baffle. The baffle may be attached to the outer side of the second end wall facing away from the stator. The baffle may be provided with a baffle opening smaller than the second rotor opening, and the shaft passes through the baffle opening.

[0041] According to a second aspect of the present application, an embodiment of the present application provides a household appliance, wherein the household appliance includes a motor according to an embodiment of the present application.

[0042] According to an optional embodiment of the present application, the household appliance is a range hood. The motor may be arranged to be suitable for driving the impeller of the fan of the range hood to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0044] Figure 1 and Figure 2 Schematically showing a perspective view and a cross-sectional view of a motor for a household appliance according to an exemplary embodiment of the present application;

[0045] Figure 3 and Figure 4 Schematically shows Figure 2 An enlarged view of the circled portion A in FIG.

[0046] Figure 5 and Figure 3 Similarly, a partial cross-sectional view of a motor according to an exemplary embodiment of the present application is shown;

[0047] Figure 6 and Figure 7 Schematically showing views of a shaft, a blocking member, and a first end wall in a motor according to an exemplary embodiment of the present application in an exploded state and an assembled state, respectively;

[0048] Figure 8 A blocking member and a first end wall in a motor according to an exemplary embodiment of the present application are schematically shown in a cross-sectional view;

[0049] Fig. 9 and Figure 3 Similarly, a partial cross-sectional view of a motor according to an exemplary embodiment of the present application is shown; and

[0050] Fig.10 , Fig.11 and Fig.12 A fan of a household appliance according to an exemplary embodiment of the present application is schematically shown.

[0051] Reference numerals list

[0052] 1 axis

[0053] 11 Installation recess

[0054] 2 Stator

[0055] 21 Stator winding

[0056] 3 Rotor

[0057] 31 First end wall

[0058] 311 First rotor opening

[0059] 312 End wall body

[0060] 3121 Outer ring

[0061] 3122 Inner ring

[0062] 3123 Steps

[0063] 313 End wall edge

[0064] 314 End wall groove

[0065] 3141 Third slot side

[0066] 3412 Fourth slot side

[0067] 3143 Second slot bottom

[0068] 315 Second outer surface

[0069] 32 Outer wall

[0070] 33 Second end wall

[0071] 331 Second rotor opening

[0072] 34 Lining

[0073] 35 Magnet

[0074] 4 Stopper

[0075] 41 Blocking Slot

[0076] 411 First slot side

[0077] 412 Second slot side

[0078] 413 Bottom of first groove

[0079] 42 Lead hole

[0080] 43 first outer surface

[0081] 44 Blocking Edge

[0082] 5 Wire

[0083] 6 Bearings

[0084] 7 Baffle

[0085] 71 Baffle opening

[0086] 9 Gap

[0087] 100 Motor

[0088] 200 Impeller

[0089] 300 Snail

[0090] 400 Bracket DETAILED DESCRIPTION

[0091] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the scope of protection of the present application.

[0092] First, for ease of understanding, let's go back to the description in the background technology section. The motors used for household appliances in the prior art have problems such as oil smoke and water vapor easily entering the motor, complex motor structure, high assembly difficulty and / or high dimensional accuracy requirements.

[0093] In view of at least one of the above technical problems or other possible technical problems, an exemplary embodiment of the present application provides a motor for a household appliance. The motor includes: a shaft; a stator, which is fixedly arranged around the shaft; a rotor, which is arranged to be able to rotate around the stator and the shaft, and the rotor includes a first end wall located axially outside the stator, the first end wall is provided with a first rotor opening, and the shaft passes through the first rotor opening; and a blocking member, which is fixedly arranged around the shaft and closes the first rotor opening.

[0094] In order to better understand the present application, the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the exemplary embodiments according to the present application, a motor for a range hood will be used as an example for description. However, it should be understood that the household appliance according to the present application may also be other household appliances, such as an oven, a refrigerator, a washing machine, a dishwasher, etc.

[0095] Figure 1 and Figure 2 A perspective view and a cross-sectional view of a motor 100 for a household appliance according to an exemplary embodiment of the present application are schematically shown respectively.

[0096] like Figure 1 and Figure 2 As shown, the motor 100 includes a shaft 1, a stator 2, a rotor 3 and a blocking member 4. The stator 2 is fixedly arranged around the shaft 1. The rotor 3 is arranged to be able to rotate around the stator 2 and the shaft 1. Therefore, the rotor 3 is an outer rotor, and the motor 100 is an outer rotor type motor 100. The rotor 3 includes a first end wall 31 located axially outside the stator 2. The first end wall 31 is provided with a first rotor opening 311, and the shaft 1 passes through the first rotor opening 311. The blocking member 4 is fixedly arranged around the shaft 1 and closes the first rotor opening 311.

[0097] In the household appliance, the blocking member 4 can effectively prevent foreign matter (such as oil smoke, water vapor, etc.) from entering the interior of the motor 100. This is particularly advantageous for a household appliance implemented as a range hood. Thus, oil smoke can be prevented from entering and accumulating in the motor 100, thereby improving the reliability and service life of the motor 100 and thus the range hood. This arrangement of the blocking member 4 makes the motor 100 simple in structure and does not significantly increase the difficulty of assembling the motor 100.

[0098] The blocking member 4 can be constructed as an elastic body made of elastic material. This helps to reduce the difficulty of assembling and disassembling the motor 100. Even if the blocking member 4 and the first end wall 31 are corroded due to oil smoke and other reasons after the motor 100 has been working for a period of time, the blocking member 4 as an elastic body can still make the motor 100 easy to disassemble and repair. In addition, the blocking member 4 and the shaft 1 can form a sealed connection in a simple manner without relying on additional sealing components or sealants.

[0099] For example, the blocking member 4 can be configured as a rubber member. The first end wall 31 can be configured as a metal member, such as made of steel. Thus, the blocking member 4 and the first end wall 31 can be prevented from being bonded together due to corrosion or rust.

[0100] In other embodiments, the blocking member 4 may also be made of other materials, such as hard plastic or metal.

[0101] See also Figure 2 The blocking member 4 and the first end wall 31 partially overlap each other when viewed in the radial direction and the axial direction. Thus, a tortuous gap 9 can be formed between the blocking member 4 and the first end wall 31. This is beneficial to prevent foreign matter from entering the motor 100.

[0102] The blocking member 4 and the first end wall 31 are arranged in a non-contact manner relative to each other. Therefore, during the operation of the motor 100, the rotor 3 rotates relative to the shaft 1, and the first end wall 31 rotates relative to the blocking member 4 accordingly without being hindered. In addition, the rotation of the rotor 3 will not cause the first end wall 31 or the blocking member 4 to be damaged, for example, due to friction.

[0103] exist Figure 2 In the illustrated embodiment, the blocking member 4 may be provided with a blocking groove 41 surrounding the axial direction. The first end wall 31 may include an end wall body 312 and an end wall edge 313 located radially inward of the end wall body 312. The end wall edge 313 surrounds the first rotor opening 311 and extends into the blocking groove 41. Through the blocking groove 41 and the end wall edge 313, a reliable dynamic seal may be formed between the blocking member 4 and the end wall edge 313. Thus, each component does not need to have high dimensional accuracy and can effectively prevent foreign matter from entering the motor 100.

[0104] Optionally, the blocking groove 41 is open in the axial direction. The end wall body 312 of the first end wall 31 may be transverse to the axial direction, and the end wall edge 313 of the first end wall 31 extends from the end wall body 312 in the axial direction into the blocking groove 41. This helps to simplify the assembly process of the motor 100. The blocking member 4 and the rotor 3 can be assembled in the axial direction.

[0105] In particular, the end wall edge 313 of the first end wall 31 can extend from the end wall body 312 in the axial direction toward the stator 2. Accordingly, the blocking groove 41 is open in the direction away from the stator 2. This is particularly helpful for achieving convenient assembly. The blocking member 4 can be fixedly connected to the shaft 1 in advance, and then the first end wall 31 is sleeved on the shaft 1 in the axial direction.

[0106] Figure 3 and Figure 4 Schematically shows Figure 2 Magnified view of the circled portion A in FIG.

[0107] like Figure 3 As shown, the blocking groove 41 may include a first groove side surface 411 and a second groove side surface 412 opposite to each other and a first groove bottom surface 413 connecting the first groove side surface 411 and the second groove side surface 412. The second groove side surface 412 is located radially outside the first groove side surface 411. The second groove side surface 412 may, for example, extend in the axial direction away from the first groove bottom surface 413 and exceed the first groove side surface 411.

[0108] The first radial spacing d1 between the end wall edge 313 and the first groove side surface 411 can be between 0.5 mm and 1.5 mm, especially 1 mm. The second radial spacing d2 between the end wall edge 313 and the second groove side surface 412 can be between 0.5 mm and 1.5 mm, especially 1 mm. The first axial spacing d3 between the end wall edge 313 and the first groove bottom surface 413 can be between 0.5 mm and 1.5 mm, especially 1 mm.

[0109] The above spacing arrangement is particularly conducive to achieving reliable dynamic sealing. On the one hand, it can effectively prevent foreign matter such as oil smoke or water vapor from entering the motor 100, and on the other hand, it can ensure that the motor 100 operates reliably without unexpected collision and friction between components. In addition, the requirements for the dimensional accuracy of the first end wall 31 and the blocking member 4 can be reduced.

[0110] The length of the end wall edge 313 extending into the blocking groove 41 can be, for example, between 3 mm and 5 mm, and in particular, 3.5 mm. Specifically, the larger of the axial overlap length between the end wall edge 313 and the first groove side surface 411 and the axial overlap length between the end wall edge 313 and the second groove side surface 412 (in an exemplary embodiment according to the present invention, the axial overlap length between the end wall edge 313 and the second groove side surface 412) is between 3 mm and 5 mm, and in particular, 3.5 mm.

[0111] In an exemplary embodiment according to the present invention, the first end wall 31 may be provided with an end wall groove 314 surrounding the axial direction. The blocking member 4 includes a blocking edge 44 located at the radial outer side thereof, and the blocking edge 44 may extend into the end wall groove 314. The end wall groove 314 is, for example, adjacent to the rotor 3 opening and / or located at the radial outer side of the end wall edge 313. With the help of the end wall groove 314, a reliable dynamic seal can also be formed between the blocking member 4 and the end wall.

[0112] Optionally, the end wall groove 314 is bounded on the radial inner side by the end wall edge 313, and the blocking groove 41 may be bounded on the radial outer side by the blocking edge 44. By combining the blocking groove 41 and the end wall groove 314, a meandering gap 9 between the first end wall 31 and the blocking member 4 can be formed in a compact manner. Thus, the reliability of the dynamic seal can be further improved.

[0113] Optionally, the blocking edge 44 extends in the axial direction, and the end wall groove 314 may be open in the axial direction, which helps to simplify the assembly process of the motor 100. The blocking member 4 and the rotor 3 may be assembled in the axial direction.

[0114] In particular, the blocking edge 44 extends away from the stator 2. Accordingly, the end wall groove 314 is open in the direction toward the stator 2. This is particularly helpful for convenient assembly. The blocking member 4 can be fixedly connected to the shaft 1 in advance, and then the first end wall 31 is sleeved on the shaft 1 in the axial direction.

[0115] See also Figure 4 The end wall groove 314 may include a third groove side surface 3141 and a fourth groove side surface 3142 that are opposite to each other and a second groove bottom surface 3143 connecting the third groove side surface 3141 and the fourth groove side surface 3142. The fourth groove side surface 3142 is located radially outside the third groove side surface 3141. The third groove side surface 3141 may, for example, extend in the axial direction away from the second groove bottom surface 3143 and beyond the fourth groove side surface 3142.

[0116] The third radial spacing d4 between the blocking edge 44 and the third groove side 3141 is, for example, between 0.5 mm and 1.5 mm, in particular 1 mm. The fourth radial spacing d5 between the blocking edge 44 and the fourth groove side 3142 can be between 0.5 mm and 1.5 mm, in particular 1 mm. The second axial spacing d6 between the blocking edge 44 and the second groove bottom 3143 can be between 0.5 mm and 1.5 mm, in particular 1 mm.

[0117] The above spacing arrangement is particularly conducive to achieving reliable dynamic sealing. On the one hand, it can effectively prevent foreign matter such as oil smoke or water vapor from entering the motor 100, and on the other hand, it can ensure that the motor 100 operates reliably without unexpected collision and friction between components. In addition, the requirements for the dimensional accuracy of the first end wall 31 and the blocking member 4 can be reduced.

[0118] In the case where a tortuous and / or relatively narrow gap 9 is formed between the blocking member 4 and the first end wall 31, configuring the blocking member 4 as an elastic body made of elastic material, in particular as a rubber member as described above, will be particularly helpful in reducing the difficulty of assembling and disassembling the motor 100. This can, for example, prevent the blocking member 4 and the first end wall 31 from being bonded together due to oil smoke accumulation or rust, thereby making it difficult to disassemble.

[0119] The length of the blocking edge 44 extending into the end wall groove 314 is, for example, between 3 mm and 5 mm, and is particularly 3.5 mm. Specifically, at least one of the larger of the overlapping length of the blocking edge 44 with the third groove side 3141 in the axial direction and the overlapping length with the fourth groove side 3142 in the axial direction (in an exemplary embodiment according to the present invention, the overlapping length of the blocking edge 44 with the third groove side 3141 in the axial direction) is between 3 mm and 5 mm, and is particularly 3.5 mm.

[0120] In another embodiment, the first end wall 31 may be provided with the end wall groove 314 , while the blocking member 4 does not have the blocking groove 41 .

[0121] Back to Figure 2 The first end wall 31 may include an outer ring portion 3121, an inner ring portion 3122 located radially inward of the outer ring portion 3121, and a step portion 3123 located between the outer ring portion 3121 and the inner ring portion 3122. The inner ring portion 3122 may be offset in an axially outward direction relative to the outer ring portion 3121. The blocking member 4 may be located radially inward of the step portion 3123. This helps to make the motor 100 have a compact structure.

[0122] from Figure 1 and Figure 2 It can also be seen that the blocking member 4 may be provided with a lead hole 42. The wire 5 passes through the blocking member 4 via the lead hole 42. The wire 5 may be used to transmit power or electrical signals to components inside the motor 100. For example, the wire 5 may be connected to the stator 2 to supply power to the stator winding 21 of the stator 2. Providing the lead hole 42 for the wire 5 in the blocking member 4 helps to enhance the sealing of the motor 100.

[0123] It is particularly advantageous that the blocking member 4 is constructed as an elastic body made of an elastic material and is provided with a lead-in hole 42. Thus, the wire 5 passing through the lead-in hole 42 can form a sealed connection with the blocking member 4 at the lead-in hole 42 without the need for an additional seal. Therefore, the motor 100 can have a relatively simple structure and assembly process, and has good sealing performance.

[0124] The lead-in hole 42 may penetrate the blocking member 4 in the axial direction. Accordingly, the lead 5 may be led out in the axial direction.

[0125] The wire guide hole 42 may be located in the radial direction between the shaft 1 and the edge of the first rotor opening 311. For example, the wire guide hole 42 may be centered between the shaft 1 and the edge of the first rotor opening 311.

[0126] Figure 5 and Figure 3 Similarly, a partial cross-sectional view of the motor 100 according to the exemplary embodiment of the present application is shown.

[0127] like Figure 5 As shown, in an exemplary embodiment according to the present application, the blocking groove 41 and / or the end wall groove 314 may not be provided. The blocking edge 44 of the blocking member 4 located at its outer periphery extends axially radially outside the end wall edge 313 of the first end wall 31 located at its inner periphery. The radial gap between the blocking edge 44 and the end wall edge 313 may be, for example, between 0.5 mm and 1.5 mm.

[0128] The barrier 4 and the first end wall 31 may be arranged contactless relative to each other and may partially overlap each other viewed in both radial and axial directions. The gap 9 between the barrier 4 and the first end wall 31 may have at least one L-shaped meandering section.

[0129] Figure 6 and Figure 7 The shaft 1 , the blocking member 4 , and the first end wall 31 in the motor 100 according to the exemplary embodiment of the present application are schematically shown in a disassembled state and an assembled state, respectively. Figure 8 The blocking member 4 and the first end wall 31 in the motor 100 according to the exemplary embodiment of the present application are schematically shown in a cross-sectional view, wherein the cross-sectional position can be referred to as Figure 7 Section line BB is shown.

[0130] like Figure 6 As shown, the shaft 1 may be provided with a mounting recess 11 for the blocking member 4, the mounting recess 11 extending in the circumferential direction and recessed radially inward. The blocking member 4 may be configured in a disc shape. The first end wall 31 is provided with an end wall edge 313 and a first rotor opening 311 surrounded by the end wall edge 313.

[0131] like Figure 7 and Figure 8 As shown, in the assembled state, the blocking member 4 can be sleeved on the shaft 1 and embedded in the mounting recess 11, so as to be fixed relative to the shaft 1 at least in the axial direction. The blocking member 4 closes the first rotor opening 311 of the first end wall 31. The end wall edge 313 extends into the blocking groove 41.

[0132] In further embodiments, the blocking member 4 may be formed as an integral piece with the shaft 1. Alternatively, the blocking member 4 may be mounted to the stator 2.

[0133] See again Figure 2 According to an exemplary embodiment of the present application, the rotor 3 may include: a second end wall 33 located at an end opposite to the first end wall 31 in the axial direction. The second end wall 33 may be provided with a second rotor opening 331, and the shaft 1 passes through the second rotor opening 331. The rotor 3 may also include a lining wall 34 extending from the second end wall 33 in the axial direction at the second rotor opening 331.

[0134] The motor 100 may include a bearing 6. The bearing 6 is used to rotatably support the rotor 3 on the shaft 1. The bearing 6 may be sandwiched between the lining wall 34 and the shaft 1 in a radial direction. Thus, the bearing 6 not only plays a supporting role, but also can prevent foreign matter from entering the motor 100 through the second rotor opening 331.

[0135] Optionally, all bearings 6 of the motor 100 arranged between the rotor 3 and the shaft 1 are clamped between the lining wall 34 and the shaft 1. Figure 2 As shown, two bearings 6 (or a pair of bearings 6 ) are provided between the rotor 3 and the shaft 1 , and the two bearings 6 are clamped between the lining wall 34 and the shaft 1 .

[0136] The lining wall 34 may extend from the second end wall 33 in a direction toward the stator 2. At least most of the bearing 6 is surrounded by the stator winding 21 of the stator 2 on its radial outer side. Accordingly, at least most of the bearing 6 is in the same axial position as the stator winding 21 of the stator 2. Therefore, the motor 100 can have a compact structure, in particular, a reduced axial dimension.

[0137] The rotor 3 may further include: an outer wall 32 connecting the first end wall 31 and the second end wall 33 , wherein the outer wall 32 and the first end wall 31 and the second end wall 33 enclose a cavity for accommodating the stator 2 ; and a magnet 35 fixed on a side of the outer wall 32 facing the stator 2 .

[0138] The motor 100 may further include a baffle 7. The baffle 7 may be attached to the outer side of the second end wall 33 facing away from the stator 2. The baffle 7 may be provided with a baffle opening 71 smaller than the second rotor opening 331, and the shaft 1 passes through the baffle opening 71.

[0139] As an example, the outer side wall 32, the second end wall 33 and the lining wall 34 may be formed as an integral piece. The outer side wall 32 may be fixedly connected to the first end wall 31, for example, by screw connection.

[0140] Fig. 9 and Figure 3 Similarly, a partial cross-sectional view of the motor 100 according to the exemplary embodiment of the present application is shown.

[0141] In this embodiment, the blocking member 4 may have a first outer surface 43 exposed in the axial direction away from the stator 2 through the first rotor opening 311. The first outer surface 43 is, for example, flat. Optionally, the blocking member 4 may be provided with a recess and / or a protrusion on the first outer surface 43.

[0142] The first end wall 31 may have an opening edge away from the stator 2 that defines a first rotor opening 311. The first outer surface 43 may be flush with the opening edge in the axial direction or protrude beyond the opening edge in the axial outward direction. This helps prevent foreign matter, especially liquid oil or water, from entering the motor 100. During the operation of the motor 100, foreign matter on the first outer surface 43 of the blocking member 4 can be carried away by the radially outward airflow caused by the rotation of the rotor 3, and will not accumulate at the blocking member 4.

[0143] Optionally, the first end wall 31 has a second outer surface 315 facing away from the stator 2. The first outer surface 43 may be flush with the second outer surface 315 in the axial direction or protrude beyond the second outer surface 315 in the axial outward direction, for example.

[0144] Fig.10 , Fig.11 and Fig.12 A fan of a household appliance according to an exemplary embodiment of the present application is schematically shown. Fig.11 Shows the Fig.10 A cross-sectional view along section line CC is shown. Fig.12 An exploded view of the blower is shown.

[0145] In this embodiment, the household appliance can be implemented as a range hood. The fan can provide an airflow for sucking and discharging oil smoke or water vapor generated during cooking. The fan can include a motor 100 and an impeller 200 driven by the motor 100. The motor 100 can be constructed as described above. The rotor 3 of the motor 100 can be fixedly connected to the impeller 200.

[0146] The fan may further include a volute 300. The volute 300 may be used to guide the airflow generated by the rotating impeller 200.

[0147] In addition, the fan may further include a bracket 400. The shaft 1 of the motor 100 may be fixedly connected to the volute 300 via the bracket 400, for example.

[0148] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative, not restrictive, unless otherwise stated. In specific implementations, multiple features may be combined with each other, depending on actual needs, where technically feasible. In particular, the features in different embodiments may also be combined with each other. Various replacements, changes, and modifications may also be conceived without departing from the spirit and scope of the present application.

Claims

1. A motor for household appliances, characterized in that: The motor (100) comprises: Axis (1); a stator (2) fixedly arranged around the shaft (1); a rotor (3) arranged to be rotatable around the stator (2) and the shaft (1), the rotor (3) comprising a first end wall (31) located axially outside the stator (2), the first end wall (31) being provided with a first rotor opening (311), and the shaft (1) passing through the first rotor opening (311); and A blocking element (4) is fixedly arranged around the shaft (1) and closes the first rotor opening (311).

2. The motor according to claim 1, characterized in that The blocking member (4) is provided with a blocking groove (41) surrounding the axial direction, the first end wall (31) comprises an end wall body (312) and an end wall edge (313) located radially inside the end wall body (312), the end wall edge (313) surrounds the first rotor opening (311) and extends into the blocking groove (41); and / or The first end wall (31) is provided with an end wall groove (314) surrounding the axial direction, and the blocking member (4) includes a blocking edge (44) located on the radial outer side thereof, and the blocking edge (44) extends into the end wall groove (314).

3. The motor according to claim 2, characterized in that The blocking groove (41) is open in the axial direction, the end wall body (312) of the first end wall (31) is transverse to the axial direction, and the end wall edge (313) of the first end wall (31) extends from the end wall body (312) in the axial direction; and / or The length of the end wall edge (313) extending into the blocking groove (41) is between 3 mm and 5 mm; and / or The end wall groove (314) is open in the axial direction, and the blocking edge (44) extends in the axial direction; and / or The length of the blocking edge (44) extending into the end wall groove (314) is between 3 mm and 5 mm.

4. The motor according to claim 3, characterized in that The blocking groove (41) comprises a first groove side surface (411) and a second groove side surface (412) opposite to each other, and a first groove bottom surface (413) connecting the first groove side surface (411) and the second groove side surface (412), the second groove side surface (412) being located radially outward of the first groove side surface (411), wherein: A first radial distance between the end wall edge (313) and the first groove side (411) is between 0.5 mm and 1.5 mm, and / or A second radial distance between the end wall edge (313) and the second groove side (412) is between 0.5 mm and 1.5 mm, and / or A first axial distance between the end wall edge (313) and the first groove bottom surface (413) is between 0.5 mm and 1.5 mm, and / or The second groove side surface (412) extends beyond the first groove side surface (411) in the axial direction away from the first groove bottom surface (413); and / or The end wall groove (314) includes a third groove side surface (3141) and a fourth groove side surface (3142) opposite to each other and a second groove bottom surface (3143) connecting the third groove side surface (3141) and the fourth groove side surface (3142), wherein the fourth groove side surface (3142) is located radially outward of the third groove side surface (3141), wherein: A third radial distance between the blocking edge (44) and the third groove side (3141) is between 0.5 mm and 1.5 mm, and / or A fourth radial distance between the blocking edge (44) and the fourth groove side (3142) is between 0.5 mm and 1.5 mm, and / or The second axial distance between the blocking edge (44) and the second groove bottom surface (3143) is between 0.5 mm and 1.5 mm, and / or The third groove side surface (3141) extends beyond the fourth groove side surface (3142) in the direction axially away from the second groove bottom surface (3143).

5. The motor according to any one of claims 1 to 4, characterized in that: The barrier (4) and the first end wall (31) are arranged in a non-contact manner relative to each other; and / or The blocking member (4) and the first end wall (31) partially overlap each other when viewed in both the radial direction and the axial direction; and / or A gap (9) is formed between the blocking member (4) and the first end wall (31), and the gap (9) has at least one L-shaped bending section.

6. The motor according to any one of claims 1 to 4, characterized in that: The first end wall (31) includes an outer ring portion (3121), an inner ring portion (3122) located radially inside the outer ring portion (3121), and a step portion (3123) located between the outer ring portion (3121) and the inner ring portion (3122), wherein the inner ring portion (3122) is offset axially outward relative to the outer ring portion (3121), and the blocking member (4) is located radially inside the step portion (3123).

7. The motor according to any one of claims 1 to 4, characterized in that: The blocking member (4) is configured as an elastic body made of elastic material; and / or The blocking member (4) is configured as a rubber member; and / or The blocking member (4) is configured in a disc shape; and / or The shaft (1) is provided with a mounting recess (11) for the blocking member (4), the mounting recess (11) extending in the circumferential direction and recessed radially inward, the blocking member (4) being embedded in the mounting recess (11); and / or The blocking member (4) is provided with a wire lead hole (42), and the wire (5) passes through the blocking member (4) via the wire lead hole (42).

8. The motor according to any one of claims 1 to 4, characterized in that: The blocking member (4) has a first outer surface (43) exposed in an axial direction away from the stator (2) via a first rotor opening (311), wherein: The first outer surface (43) is flat; and / or The first end wall (31) has an opening edge away from the stator (2) defining a first rotor opening (311), and the first outer surface (43) is flush with the opening edge in the axial direction or protrudes beyond the opening edge in the axial outward direction; and / or The first outer surface (43) is flush with a second outer surface (315) of the first end wall (31) in the axial direction and in a direction axially facing away from the stator (2), or protrudes beyond the second outer surface (315) in the axial outward direction.

9. The motor according to any one of claims 1 to 4, characterized in that: The rotor (3) further comprises: a second end wall (33) located at an end opposite to the first end wall (31) in the axial direction, the second end wall (33) being provided with a second rotor opening (331), the shaft (1) passing through the second rotor opening (331); and a lining wall (34) extending from the second end wall (33) in the axial direction at the second rotor opening (331); The motor (100) further comprises a bearing (6) which is sandwiched between the lining wall (34) and the shaft (1) in a radial direction.

10. The motor according to claim 9, characterized in that All bearings (6) of the motor (100) arranged between the rotor (3) and the shaft (1) are clamped between the lining wall (34) and the shaft (1); and / or The lining wall (34) extends from the second end wall (33) in a direction toward the stator (2); and / or The stator (2) comprises a stator winding (21), and the bearing (6) is at least mostly located at the same axial position as the stator winding (21) of the stator (2).

11. The motor according to claim 10, characterized in that The motor (100) further comprises a baffle (7) attached to the outer side of the second end wall (33) facing away from the stator (2), the baffle (7) being provided with a baffle opening (71) smaller than the second rotor opening (331), and the shaft (1) passing through the baffle opening (71).

12. A household appliance, characterized in that: The household appliance comprises an electric motor (100) according to any one of claims 1-11.

13. The household appliance according to claim 12, characterized in that The household appliance is a range hood, and the motor (100) is arranged to be suitable for driving the impeller (200) of the fan of the range hood to rotate.

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